USA Standard Gear ZG SPRINTER-373K Ring and Pinion Set and Install Kit PackageDifferential Ring and Pinion Kit Ring and Pinion Set and Install Kit Package Ring and Pinion Set and Install Kit Package; 8. 5 in. Rear; 3. 31 Gear Ratio; 3. 73 Ring; SPECIFICATIONS: WARNING CA Proposition 65: No FEATURES: Ring and Pinion Set and Install Kit Package USA Standard Gear(R) sets the benchmark for quality OE replacement parts at affordable prices. USA Standard Gear produces the widest selection of aftermarket drivetrain replacement parts